Mechanism for the simultaneous adjustment of gaps and/or the simultaneous adjustment of angles, for the production of a multi-level or staircase structure

ABSTRACT

The invention relates to a mechanism for the simultaneous adjustment of gaps and/or angles for the production of a multi-level or stair structure. The mechanism is characterised in that it comprises a technical housing containing a gap-indicating rule which is provided with parallel inclined grooves and which moves diagonally on fixed transverse shafts. Said diagonal translational movement, performed by a forward-backward control element, causes the sliding of upper shafts and lower shafts that are interconnected by a series of V-shaped arms. The upper shafts slide in a gap-indicating slide and the lower shafts slide in the slide of the technical housing. The lower shafts are solidly connected to the pendulums bearing the plates, allowing the simultaneous adjustment of the gaps between the plates. The technical housing also contains an angle-indicating rule which is provided with parallel inclined grooves and which moves diagonally on fixed transverse shafts, said diagonal translational movement causing the simultaneous movement of sliders in the angle-indicating slide. The aforementioned sliders also pivot the pendulums via a slide-element located at the front end of the pendulums. The technical housings are secured to the wall or the side support by a mortise-and-tenon system on securing supports. According to the invention, the device is intended in particular for the production of a generally straight staircase or staircase formwork.

The field of the invention is that the adjustment devices enabling making of multi-level or staircase structures in a predetermined shape. It enables, in particular, the design of adaptable stairs or stair casing, or the making of multi-level structure requiring an option of simultaneous adjustment of consistently symmetrical gaps and/or variable angle adjustment while maintaining symmetric treads. The invention can also be used in other applications requiring a similar adjustment means such as tracings requiring adjustments of equal angles or spaces in order to make out works such as windows portals grids, but also to set up a series of tools (for drilling, welding, cutting, assembling, distributing . . . } having variable, but consistently symmetrical, gaps; the usage list is not exhaustive.

Hitherto, mobiles processes for making such structures are artisanal in nature. The professional (mason, carpenter, blacksmith . . . ) successively measures and traces each tread and riser on opposing stair stringboards. This work is not only time-consuming but subject to numerous errors: line thickness, rules slope, eye approximations, support of varying coarseness . . . ; these traditional methods can cause asymmetry problems of varying treads.

To remedy this a solution is proposed by the patent FR Number 01 04147 via a so-called screw-nut technology. The system enables simultaneous adjustment of the spaces or the angles between the riser pendulums. Given the friction generated by the screw-nut links guiding then, the force to be provided in order to set in motion a series of adjustments is such that the system locks up as soon as 3 screw-nuts are exceed and renders this technology unworkable for this kind of application.

An alternative is also proposed by the U.S. Pat. No. 2,883,759. This solution includes a device for riser positioning via two parallel screw mechanisms. One enables adjustment of spaces by a parallelogram mechanism controlled at the end by a screw that varies the space between two profiles, which deploys a double bar. Another mechanism enables management of the separation between these parallel bars in order to incline the risers connected to the two. This device is not suitable for practice by virtue of minimalism of these controls. It has considerable friction that cannot be compensated by a simple actuation of controls. With the exhibition of problems such as dust—water—sand . . . , this system appears too fragile and prone to inopportune lockups.

The objective of the invention discussed in this patent is thus innovative in that it is a simple method using sliding of shafts in slides, without screw system or the mechanical adjusting part, is completely contained in a mechanical housing which increases reliability; adaptable to all straight steps. It can also be used for making winding or spiral staircases; it is also easily and intuitively useable by the user while being manually transportable.

The mechanical system according to the invention comprises:

1) Mechanism for the simultaneous adjustment of gaps and/or angles for making a multi-level or staircase structure, characterized in that it comprises:

A—a mechanical housing (1.1) comprising, at its base, a longitudinal slide (1.2) and a longitudinal channel (1.4) in which the pendulums (5.1) slide and also transverse fixed axels (1.6) longitudinally aligned at the center of the aforementioned mechanical housing (1.1)

B—a gap-indicating rule (2.1) comprising a gap slide (2.2) having parallel oblique grooves (2.3) and a forward-backward control (2.4) provided with a locking means (2.5)

C—an angle-indicating rule (3.1) comprising an angle slide (3.2) having parallel oblique grooves (3.3) and a forward-backward control (3.4) provided with a locking means (3.5)

D—arms (4.1) hinged at one of their ends (4.2) by the lower shafts (4.4) slidable in the aforementioned longitudinal slide (1.2) of the aforementioned mechanical housing (1.1) and hinged at the other end (4.3) by the upper shafts (4.5) which slide in the aforementioned gap slide (2.2) thus forming a succession of the aforementioned arm (4.1) V-shaped hinged with an angle that is variable while maintaining the aforementioned arms (4.1) symmetric

E—the aforementioned pendulums (5.1) which each have a bore (5.2) traversed by the aforementioned lower shafts (4.4) and a slide (5.3) traversed by a slider (5.4) which moves in the aforementioned angle slide (3.2)

2) Adjustment mechanism characterized in that the gap-indicating rule (2.1) moves by sliding of the parallel oblique grooves (2.3) on the transverse fixed axels (1.6) of the mechanical housing (1.1) which generates a diagonal translation of the aforementioned gap-indicating rule (2.1) relative to the axis of the aforementioned mechanical housing (1.1).

3) Adjustment mechanism characterized in that the gap-indicating rule (2.1) is provided with a forward-backward control (2.4) enabling the aforementioned gap-indicating rule (2.1) to drive the diagonal translation which generates a change in space between the aforementioned gap-indicating rule (2.1) and the longitudinal slide (1.2) of the mechanical housing (1.1) while maintaining their parallelism.

4) Adjustment mechanism characterized in that the variation of space driven by the forward-backward control (2.4) of the gap-indicating rule (2.1) generates a simultaneous movement of the lower shafts (4.4) in the longitudinal slide (1.2) and a simultaneous movement of the upper shafts (4.5) in the gap slide (2.2) causing a simultaneous change of the gaps between the aforementioned upper shafts (4.5) and a simultaneous change of the gaps between the aforementioned lower shafts (4.5) attached to the pendulums (5.1), while complying with their symmetry.

5) Adjustment mechanism characterized in that any one of the lower shafts (4.4) can have the function of reference fixed shaft (1.3) by attaching the aforementioned fixed shaft (1.3) to the mechanical housing (1.1) wherein the aforementioned fixed shaft (1.3) is the basis for the simultaneous movement of the other lower shafts (4.4) as well as the simultaneous movement of the upper shafts (4.5) at the time of the diagonal translation of the gap-indicating rule (2.1).

6) Adjustment mechanism characterized in that the angle-indicating rule (3.1) moves by sliding of parallel oblique grooves (3.3) on the transverse fixed axels (1.6) of the mechanical housing (1.1) which generates a diagonal translation of the aforementioned angle-indicating rule (3.1) relative to the axis of the aforementioned mechanical housing (1.1).

7) Adjustment mechanism characterized in that the angle-indicating rule (3.1) is provided with a forward-backward control (3.4) enabling the aforementioned angle-indicating rule (3.1) to have a diagonal translation that generates a variation of space between the aforementioned angle-indicating rule (3.1) and the longitudinal slide (1.2) of the mechanical housing (1.1) while maintaining their parallelism.

8) Adjustment mechanism characterized in that following its positioning by human action, the variation of the space between the angle-indicating rule (3.1) and the longitudinal slide (1.2) of the mechanical housing (1.1) causes a simultaneous change of the angle of the pendulums (5.1) by displacement of the sliders (5.4) in the angle slide (3.2) which creates a rotation of the slides (5.3) about the lower shafts (4.4) attached to with the aforementioned pendulums (5.1).

9) Adjustment mechanism including a main significant feature is that each pendulum (5.1) has, in its part outside of the mechanical housing (1.1), a profile arranged with notches (5.9) and with attachment holes (5.8) for attaching it to a plate (5.6) provided with fins (5.7) that slide in the aforementioned notches (5.9) holding the aforementioned plate (5.6) thus locked on the aforementioned pendulum (5.1) and that the aforementioned attachment holes (5.8) are used for the passage of screws or spikes for the attachment of the aforementioned plate (5.6) wherein the aforementioned plate (5.6) can be a walk or a riser or any other support according to the configuration of the structure to be made.

10) Adjustment mechanism characterized in that the mechanical housing (1.1) can be attached to a lateral support by attachment mounting plates (7.1) provided with a tenon (7.3) that receives a mortise (5.5) of the pendulum (5.1) wherein other attachment means (8.1) are located on the end caps of the mechanical housing (1.1) and that the aforementioned attachment mounting plates (7.1) or the aforementioned other attachment means (8.1) can be used according to the configuration of the structure to be made.

11) An adjustment mechanism mainly characterized in that the pendulums (5.1) have a notch (6.2) for holding and pulling an elastic sealing means (6.1) of the longitudinal slit (1.4) wherein the aforementioned elastic sealing means (6.1) is located in a casing (1.5) at the base of the mechanical housing (1.1).

12) Adjustment mechanism characterized in that the mechanical housing (1.1) can be used individually or multiple mechanical housings (1.1) can be used in parallel or in extension, according to the configuration of the structure to be made.

For complementarity of explanation, the invention comprises:

A—a mechanical housing comprising:

-   -   a longitudinal slide: a slide comprises two grooves facing each         other along the length of the housing, in which slide the ends         of lower shafts     -   a longitudinal groove that enables the pendulums with plates to         move in a translation caused by the gap-indicating rule or an         angle variation caused by the angle-indicating rule; the plates         can be steps or risers, or different connecting members         transmitting simultaneous adjustments from the housing     -   a casing for guiding an elastic sealing means: this elastic         means has a function of sealing the longitudinal groove in order         to protect the inside of the mechanical housing from any         materials that can damage the operation of the mechanism; it is         penetrated by each pendulum through a suitable slit; each         pendulum having a notch that maintains the elastic means secured         to the pendulum     -   transverse axels attached to the mechanical housing distributed         on a longitudinal line to different locations designed to enable         the movement of the oblique grooves without hindering the         movement of the arms; these fixed axels have a function of         guiding the parallel oblique grooves of the gap-indicating rule         and, independently, of the angle-indicating rule during at their         respective translation

B—a gap-indicating rule positioned in the mechanical housing and comprising:

-   -   a gap slide: this slide comprises two longitudinal grooves         facing each other in which slide the ends of the upper shafts     -   parallel oblique grooves that slide on the fixed axes of the         mechanical housing during the translation of the gap-indicating         rule; these grooves being positioned oblique with respect to the         axis of the housing, this enables the gap-indicating rule to         move diagonally in the housing; this diagonal movement, during         the translation, causes the gap-indicating rule, when it is in         the upper part of the housing, to steer gradually towards the         lower part while steering towards one end of the housing. This         diagonal translation generates a simultaneous movement of upper         shafts in the gap slide and lower shafts in the longitudinal         slide; the lower shafts drive the pendulums and simultaneously         vary their spaces; the parallel oblique grooves are distributed         at various locations of the gap-indicating rule corresponding to         the transverse fixed axels of the mechanical housing, so as not         to impede the movement of arms     -   a forward-backward control to cause the diagonal translation of         the aforementioned gap-indicating rule, which generates a         simultaneous adjustment of the gaps between the different shafts         that remain consistently symmetrical; this control has a locking         means that enables immobilization of the gap-indicating rule at         the desired adjustment

C—an angle-indicating rule positioned in the mechanical housing and comprising:

-   -   an angle slide: this slide comprises two longitudinal grooves         facing each other in which slide the ends of the sliders during         the translation of the angle-indicating rule     -   parallel oblique grooves that slide on the fixed axels of the         mechanical housing during the translation of the diagonal         angle-indicating rule; these grooves being positioned oblique by         with respect to the axis of the housing. This enables the         angle-indicating rule to move diagonally in the housing. This         diagonal movement, during translation, causes the         angle-indicating rule, when the upper part of the housing, to         steer gradually towards the lower part while steering towards         one end of the housing according to the angle setting to be         effectuated; these oblique grooves are distributed in different         locations of the angle-indicating rule corresponding to the         transverse fixed axels of the mechanical housing so as not to         hinder the movement of the arms     -   a forward-backward control for causing translation of the         aforementioned angle-indicating rule, which generates a         simultaneous adjustment of the angle of the pendulums while         maintaining them symmetrical

D—arms: this are elongate flat elements with bores for being interconnected between themselves at one end by a lower shaft that slides in the longitudinal slide of the mechanical housing, and at the other end by the upper shafts that slide in the gap slide; these joints thus form a succession of V-shaped arms having an angle that is variable but consistently symmetrical

E—pendulums having:

a—a part inside of the housing, on which are located:

-   -   a bore penetrated by the lower shafts by which they are secured         in their translation movements     -   a slide traversed by a slider that moves in the angle slide     -   a notch to hold and pull an elastic means for sealing. This         elastic means has a function of preventing penetration into the         housing or of liquid or materials; it is penetrated by the         pendulums through a slit for each pendulum and tightens or         relaxes over the course of movement of the pendulums; the         pendulums traversing the longitudinal groove of the mechanical         housing in order to transmit the internal adjustment of the         aforementioned mechanical housing to the plates.

b—a part outside of the housing, which transmits the adjustments of the gap-indicating and/or angle-indicating rules to the various plates, on which are located:

-   -   notches enabling locking or attaching of tread or riser or         staircase plates     -   a mortise capable of receiving the tenon of a support mounting         plate for the installation of the housing on a wall or on any         lateral member     -   a façade having holes for attaching planks of all kinds: steps,         risers, shelves, tools . . . ; this list is not exhaustive of         possible applications.

These various mechanical elements are combined to achieve the adjustment of gaps first and independently of the complementary adjustment of angle of the following different ways:

-   -   The gap-indicating rule and the angle-indicating rule are each         provided with parallel oblique grooves enabling a diagonal         translation in the housing by sliding of the aforementioned         parallel oblique grooves on the transverse fixed axels of the         housing.     -   The gap-indicating rule is provided with a forward-backward         control enabling the aforementioned gap-indicating rule to have         a diagonal translation that varies the space between the         aforementioned gap-indicating rule and the slide of the         mechanical housing while maintaining their parallelism; this         variation spaces of generates a simultaneous movement of the         lower shafts in the longitudinal slide in the mechanical housing         and upper shafts in the slide gap-indicating of the         gap-indicating rule which simultaneously changes the gaps         between the upper shafts and the gaps between the aforementioned         lower shafts in secured to with the pendulums while respecting         their symmetry.     -   A reference fixed shaft serves as basis for the simultaneous         movement of the lower shafts and upper shafts wherein each of         the lower shafts can become reference shaft by attaching to the         mechanical housing and each of the aforementioned upper shafts         can become reference shaft by attaching to the angle-indicating         rule; there can be only one reference shaft on the entirety         mechanism and it can be located at end or in the center or on         any shaft.     -   The angle-indicating rule is provided with a forward-backward         control enabling the aforementioned angle-indicating rule to         have a diagonal translation that varies the space between the         aforementioned angle-indicating rule and the longitudinal slide         of the mechanical housing while maintaining their parallelism;         the change of space between the angle slide of the         angle-indicating rule and the longitudinal slide of the         mechanical housing generates a simultaneous change of the angle         of the pendulums by displacement of the sliders in the         aforementioned angle slide causing a rotation of the slide about         the bore of the pendulums penetrated by the lower shafts.     -   The forward-backward controls of the gap-indicating rule and of         the angle-indicating rule are provided with a desired setting         locking means in order to block any inopportune movement in         translation specific to each rule.     -   Mounting plates for attachment to a lateral support or a wall         are designed to receive the pendulums via a mortise and tenon         system in addition to other attachment means that are located on         the plugs of the ends of the mechanical housing; depending on         the situations, this can be the mortise and tenon system or         attachment means joined to the plugs that can be used or both         means jointly.     -   Each pendulum has, in its part outside of the mechanical         housing, a profile arranged with notches in order to hold there         a plate provided with fins that hold the aforementioned plate         thus locked on the pendulum wherein the plate can be a step or         riser or other elements or members according to the use for         which the mechanism is used. Each support also has, in its part         outside of the mechanical housing, an L-shaped facade having         holes for attaching the plate either by screws or any suitable         means

Furthermore, at its center, each pendulum has a notch for holding and pulling an elastic sealing means for the longitudinal channel, the elastic sealing means being located in a casing at the base of the mechanical housing; the elastic means can be a rubber seal that tightens and relaxes over the course of the movements wherein the rubber has a notch for allowing the pendulum to pass and that the rubber follows the movement of the aforementioned support; the elastic sealing means can also be a succession of metal strips each secured to a pendulum, the strips overlapping at their end

The present invention will be better understood by reference to the description and to the claims by drawings showing the system in its different operations:

FIG. 1 is a longitudinal section of the mechanical housing (1.1) in superposition with a longitudinal section of the gap-indicating rule (2.1); this assembly shows the principle of the arms (4.1) of which one end is connected to another arm (4.1) by a lower shaft (4.4) that slides in the longitudinal slide (1.2) of the mechanical housing (1.1) and the other end is connected to another arm (4.1) by an upper shaft (4.5) that slides in the gap slide (2.2); there is shown arms (4.1) in substantially at right angle position, with the gap-indicating rule (2.1) which is located further away from the longitudinal slide (1.2) and the fixed axels (1.6) at one end of the oblique groove; the reference fixed shaft being central in this presentation the pendulum having ends distant from the ends of the mechanical housing is shown.

FIG. 2 is a longitudinal sectional view of the mechanical housing (1.1) in superposition with a longitudinal section of the gap-indicating rule (2.1) as in FIG. 1, but with a different adjustment caused by a diagonal translation; thus it can be noted that the gap-indicating rule (2.1) is closer to the longitudinal groove (1.4) and that the fixed axels (1.6) are at the other end of the parallel oblique grooves; it can also be noted that the end pendulums are moved closer to the ends of the mechanical housing due to the reference fixed shaft (1.3) is central in this presentation; the gap-indicating rule (2.1) is also brought closer to one end of the mechanical housing (1.1) due to the diagonal translation caused by the forward-backward control (2.4); the gaps between the pendulums are further apart there than in FIG. 1 due to the deployment of arms (4.1) caused by the diagonal translation.

FIG. 3 is a longitudinal sectional view and in superposition:

-   -   of the mechanical housing (1.1)     -   the angle-indicating rule (3.1) or is seen the pendulum         penetrated at the bore by the lower shaft (4.4) which slides in         the longitudinal slide; also seen there is the slider (5.4)         which moves in the angle slide (3.2) by rotation of the slide         (5.3) about the lower shaft (4.4) during a translation of the         angle-indicating rule (3.1), which generates a variation of the         angle of the pendulums (5.1)

FIG. 4 is a cross-sectional view of the mechanism assembly in which is seen the mechanical housing (1.1) with:

-   -   at the base the longitudinal slit (1.4) penetrated by the         pendulum (5.1) which passes through it the elastic sealing         sealing means (6.1) guided by its casing (1.5); at the center is         seen a fixed axel (1.6) on which slide, to the left of the         gap-indicating rule (2.1), and to the right of the         angle-indicating rule (3.1)     -   the gap-indicating rule (2.1) is positioned in the upper part of         the mechanical housing (1.1) which translates through a more         retracted position of the arms (4.1) as in FIG. 1; on the         gap-indicating rule is seen the gap slide (2.2) or slide the         upper shafts (4.5) connecting the arms (4.1); the arms steer         downward in the mechanical housing (1.1) in order to be         connected by the lower shafts (4.4)     -   the angle-indicating rule (3.1) receives, at its base, the upper         part of the pendulum (5.1) which translates through a more open         angle of the positioning of the pendulum (5.1), in its part         outside of the mechanical housing, by the rotation of the         pendulum (5.1) about the lower shaft (4.4) through the bore         (5.2)

FIG. 5 is a view similar to FIG. 4 with the differences that the gap-indicating rule (2.1) and the angle-indicating rule (3.1) are in low position in the mechanical housing (1.1) as in FIG. 2 with the mechanical changes as described in FIG. 2.

FIG. 6 is a view of a pendulum (5.1) with:

-   -   the inner part of the housing which comprises the bore (5.2)         designed to be traversed by the lower shaft (4.4), the slide         (5.3) designed to be traversed by the slider (5.4), the notch         provided for holding the elastic sealing means (6.1)     -   the part outside of the housing with the notches (5.9) receiving         the fins (5.7) of the plate (5.6); also seen is the mortise         (5.5) provided for the tenon (7.3) of the support mounting plate         (7.1); on the widest part receiving the plate is seen a return         of the pendulum with holes (5.8) for attaching the plate (5.6)         by means of screws or spikes, according to the material used

FIG. 7 shows the support mounting plate (7.1) for attachment of the mechanical housing (1.1) with the tenon (7.3) arranged with the mortise (5.5) of the pendulums (5.1) and holes (7.2) for screwing or nailing on a wall or a lateral support.

FIG. 8 shows a perspective of a setup of two mechanicals housings (1.1) connected in parallel with the plates (5.6) in treads position, in the configuration of a straight staircase.

FIG. 9 shows a perspective of a setup of two mechanicals housings (1.1) connected by parallel plates (5.6) in risers position, in the configuration of a straight staircase casing.

Implementation of making a straight flight of stairs having 9 steps (FIG. 8):

The trace of the first and last tread and riser are made on a wall (or lateral support):

-   -   An attachment mounting plate is fixed on each trace (1st and         9th) at the angle of the tread.     -   The tracing is reproduced on the other lateral wall.     -   The attachment mounting plates are attached on the 1st and the         9th tread on the second lateral wall.     -   The mechanical housing is taken and the mortise of the first         pendulum is hooked hanged on the pin of a base mounting plate         (first tread).     -   The forward-backward control of the gap-indicating rule is         manipulated until the mortise of the 9th tread matches the tenon         of the attachment mounting plate of the 9th tread     -   The control is locked by its locking means.     -   Additionally the housing is attached by the attachment means         secured to the plugs     -   The pendulums attached to the attachment mounting plates are         automatically manipulated by the angle-indicating rule; it can         be manipulated by means of the control of the rule which is         subsequently locked.     -   Exactly the same maneuvers are reproduced on the second lateral         wall.     -   The plates are introduced successively by sliding them into the         notches of the pendulums; these plates can be elements sliding         into one another in order to instantly adjust the plates to the         width of the stairs; the plates can be attached to the hole         means in the facade of the pendulums with screw nuts or spikes,         according to the material used for the plates.

The staircase structure is thus made!

The invention is applicable to many other uses than the steps of straight staircases and is capable of different variants of execution, including:

-   -   The mechanism can be used to make structures or traces requiring         equal spaces such as balusters, railings, gates, staircases of         all kinds in various materials.     -   The mechanism can be used to make adjustable shelving or any         other movable or non-movable structure     -   The mechanism can be used as a base structure for adjusting         successive tools for drilling, cutting, welding or any other         similar application,     -   The mechanism can be adapted to agricultural or industrial         machines of all types requiring a space or angle adjustment.

This list is not exhaustive of all use possibilities of the invention. 

1. Mechanism for simultaneous adjustment of gaps and/or angles for making a multi-level or staircase structure, characterized in that it comprises: A—a mechanical housing comprising, at its base, a longitudinal slide and a longitudinal channel in which the pendulums slide and also transverse fixed axels longitudinally aligned at the center of the aforementioned mechanical housing B—a gap-indicating rule comprising a gap slide having parallel oblique grooves and a forward-backward control provided with a locking means C—an angle-indicating rule comprising an angle slide having parallel oblique grooves and a forward-backward control provided with a locking means D—arms hinged at one of their ends by the lower shafts slidable in the aforementioned longitudinal slide of the aforementioned mechanical housing and hinged at the other end by the upper shafts which slide in the aforementioned gap slide thus forming a succession of the aforementioned arms V-shaped hinged with an angle that is variable while maintaining the aforementioned arms symmetric E—the aforementioned pendulums which each have a bore traversed by the aforementioned lower shafts and a slide traversed by a slider which moves in the aforementioned angle slide
 2. Adjustment mechanism according to claim 1 characterized in that the gap-indicating rule moves by sliding of the parallel oblique grooves on the transverse fixed axels of the mechanical housing which generates a diagonal translation of the aforementioned gap-indicating rule relative to the axis of the aforementioned mechanical housing.
 3. Adjustment mechanism according to claim 1 characterized in that the gap-indicating rule is provided with a forward-backward control enabling the aforementioned gap-indicating rule to drive the diagonal translation which generates a change in space between the aforementioned gap-indicating rule and the longitudinal slide of the mechanical housing while maintaining their parallelism.
 4. Adjustment mechanism according to claim 1, characterized in that the variation of space driven by the forward-backward control of the gap-indicating rule generates a simultaneous movement of the lower shafts in the longitudinal slide and a simultaneous movement of the upper shafts in the gap slide causing a simultaneous change of the gaps between the aforementioned upper shafts and a simultaneous change of the gaps between the aforementioned lower shafts attached to the pendulums, while complying with their symmetry.
 5. Adjustment mechanism according to claim 1, characterized in that any one of the lower shafts can have the function of reference fixed shaft by attaching the aforementioned fixed shaft to the mechanical housing wherein the aforementioned fixed shaft is the basis for the simultaneous movement of the other lower shafts as well as the simultaneous movement of the upper shafts at the time of the diagonal translation of the gap-indicating rule.
 6. Adjustment mechanism according to claim 1 characterized in that the angle-indicating rule moves by sliding of parallel oblique grooves on the transverse fixed axels of the mechanical housing which generates a diagonal translation of the aforementioned angle-indicating rule relative to the axis of the aforementioned mechanical housing.
 7. Adjustment mechanism according to claim 1 characterized in that the angle-indicating rule is provided with a forward-backward control enabling the aforementioned angle-indicating rule to have a diagonal translation which generates a variation of space between the aforementioned angle-indicating rule and the longitudinal slide of the mechanical housing while maintaining their parallelism.
 8. Adjustment mechanism according to claim 1, characterized in that the variation of the space between the angle-indicating rule and the longitudinal slide of the mechanical housing causes a simultaneous change of the angle of the pendulums by displacement of the sliders in the angle slide which creates a rotation of the slides about the lower shafts attached to the aforementioned pendulums.
 9. Adjustment mechanism according to claim 1, characterized in that each pendulum has, in its part outside of the mechanical housing, a profile arranged with notches and with attachment holes for attaching to a plate provided with fins which slide in the aforementioned notches holding the aforementioned plate thus locked on the aforementioned pendulum and that the aforementioned attachment holes are used for the passage of screws or spikes for the attachment of the aforementioned plate wherein the aforementioned plate can be a tread or a riser or any other support according to the configuration of the structure to be made.
 10. Adjustment mechanism according to claim 1 characterized in that the mechanical housing can be attached to a lateral support by attachment mounting plates provided with a tenon that receives a mortise of the pendulum wherein other attachment means are located on the end caps of the mechanical housing and that the aforementioned attachment mounting plates or the aforementioned other attachment means can be used according to the configuration of the structure to be made.
 11. Adjustment mechanism according to claim 1 characterized in that the pendulums have a notch for holding and pulling an elastic sealing means of the longitudinal slit wherein the aforementioned elastic sealing means is located in a casing at the base of the mechanical housing.
 12. Adjustment mechanism according to claim 1, characterized in that the mechanical housing can be used individually or that multiple mechanical housings can be used in parallel or in extension, according to the configuration of the structure to be made. 